A closely wound rectangular coil of 200 turns and size `0.30 xx 0.05` m is placed perpedicular to a megnetic field of induction `0.20 Wb m^(-2)` Calculate the induced e.m.f. in the coil, when megnetic induction drop to 0.5 `Wb m^(-2)` in 0.02 s.

Explanation

To solve the problem of calculating the induced electromotive force (e.m.f.) in a rectangular coil when the magnetic induction changes, we can follow these steps:

### Step 1: Identify the given parameters
- Number of turns (N) = 200
- Dimensions of the coil: Length (l) = 0.30 m, Width (w) = 0.05 m
- Initial magnetic induction (B1) = 0.20 Wb/m²
- Final magnetic induction (B2) = 0.15 Wb/m²
- Time interval (Δt) = 0.02 s
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